U3 (disambiguation)

U3 or U-3 may refer to:

• Secure Digital (SD) Cards, class of speed
• U3 LLC, a computer company
  • U3, a design specification for computer peripherals created by U3, LLC
• The IATA designator code for the airline Avies
• U3, an underground rapid transit line in many major German/Austrian cities. See:
  • U3 (Berlin U-Bahn)
  • Frankfurt U-Bahn
  • Hamburg U-Bahn
  • Munich U-Bahn
  • Nuremberg U-Bahn
  • U3 (Vienna U-Bahn), of the Vienna U-Bahn system.
• U3, an unemployment figure released by the United States Bureau of Labor Statistics
• German submarine U-3, one of several German submarines
• U-3, the military model of the Cessna 310 aircraft
• Small nucleolar RNA U3, a type of non-coding RNA
• Ultima III: Exodus, a 1983 video game
• Uncharted 3: Drake's Deception, a 2011 video game.